HOT FLOW-ANALYSIS OF SWIRLING SUDDEN-EXPANSION DUMP COMBUSTOR

Hot flow of a sudden-expansion dump combustor with swirling is analysed by employing an infinite chemical reaction rate. Turbulence properties are closed using one type of algebraic Reynolds stress model and two types of k-epsilon model. One of the k-epsilon models includes a swirling effect modification to the epsilon-equation. Computations have been performed by the SIMPLE-C algorithm with a power-law scheme. The calculated results of the momentum fields and turbulence quantities for swirling flow are compared with the available experimental data. It is shown that the standard k-epsilon model gives poor prediction of the mean velocity, particularly the tangential velocity. For the hot flow analysis of a sudden-expansion dump combustor with swirling flow it is suggested that it is necessary to use the modified k-epsilon model or algebraic Reynolds stress model.